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Goodwill - Allocation of Goodwill to Cash-Generating Units (Details) - Goodwill (Note 7) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 18,708 € 18,471 € 16,519
Telefónica Spain | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,291 4,291 4,291
Telefónica Brazil | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 8,076 7,752 6,278
Telefónica Germany | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,386 4,386 4,386
Telefónica Hispam | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 1,108 1,215 1,166
Telefónica Hispam | Operating segments | Colombia      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 164 135  
Telefónica Hispam | Operating segments | Ecuador      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 75 137  
Telefónica Hispam | Operating segments | Chile      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 615 652  
Telefónica Hispam | Operating segments | Peru      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 229 265  
Telefónica Hispam | Operating segments | Uruguay      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 23 23  
Telefónica Hispam | Operating segments | Others T. Hispam      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 2 3  
Other companies | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 847 827 € 398
Other companies | Operating segments | Telefonica Tech UK & Ireland, Limited      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 438 429  
Other companies | Operating segments | BE-terna      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 282 279  
Other companies | Operating segments | Others      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 127 € 119